Gasboy CFN Series Diagnostic Manual - Manual (Page 65)

03/19/04 3-1
Section 3
SITE CONTROLLER II
DESCRIPTION
The Site Controller II is the heart of the CFN system at the fueling site. It controls and allows
interaction between all your automated fueling equipment, including electronic pumps, pump
control devices, and terminals that are activated by a customer. The unit uses advanced
microprocessor technology and incorporates multiple hardware and software safeguards. The
Site Controller II comes standard with a 3-1/2" disk drive and a hard drive for mass storage of
data and loading in operating system programs. A second 3-1/2" disk drive can be ordered in
place of the hard drive. A built-in keyswitch can be used to limit access to specified commands.
The Site Controller II contains four asynchronous RS-232 ports. Port 0 is used for communication
to a data terminal (logger). Port 2 is used for communications through a modem or to a
computer. Ports 1 and 3 are additional RS-232 ports which can be programmed according to the
application. A logger eliminator must be connected to port 0 when a logger is not used.
Two RS-485 ports are provided for communication with the other CFN devices at the fueling site.
One of these ports connects the CFN RS-485 junction box. The RS-485 junction box provides a
means for hard-wire connections while incorporating protection circuitry to prevent noise (which
may occur on the field wiring) from reaching the site controller. The other RS-485 port connects
to the CheckPoint or Profit Point console (when used).
The pages that follow show the Site Controller II layouts.